concept HAProxy in category openshift

This is an excerpt from Manning's book OpenShift in Action. Login to get full access to this book.

$ oc describe route/app-cli Name: app-cli Namespace: image-uploader Created: About an hour ago Labels: app=app-cli Annotations: openshift.io/host.generated=true Requested Host: app-cli-image-uploader.apps.192.168.122.101.nip.io #1 exposed on router router about an hour ago Path: <none> TLS Termination: <none> Insecure Policy: <none> Endpoint Port: 8080-tcp Service: app-cli #2 Weight: 100 (100%) Endpoints: 10.129.1.112:8080 #3 #1 URL created in HAProxy #2 Associated service #3 Endpoints for the service

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When you install your OpenShift cluster, one of the services that’s created is an HAProxy service running in a container on OpenShift. HAProxy is an open source, software load-balancer application. We’ll look at this service in depth in chapter 10.

10.3.1. Using HAProxy to route requests

HAProxy (www.haproxy.org) is the front door to your applications in OpenShift. HAProxy is an open source, software-defined load balancer and proxy application. In OpenShift, it takes the URL route associated with an application and proxies those requests into the proper pod to get the requested data back to the requesting user. We won’t dig too deeply into all that HAProxy can do—we’re focusing on how OpenShift uses HAProxy. If you’d like more information about HAProxy, you can find documentation for its different versions at www.haproxy.org/#docs.

Figure 10.5. How requests are routed through HAProxy in OpenShift